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docker-compose

Mainly used for creating a system from multiple images. You still use Dockerfile's to specify each image. I will present a real example here.

debugging

Here is a useful tip, while working on the internet.nl assignment.

  • docker-compose up # starts up all 4 apps
  • docker-compose up postgres redis rabbitmq # starts only these 3
  • docker-compose up app # starts the main app alone
  • docker-compose up # tries all, but skips them when already up
  • docker-compose run app # this start the entrypoint but prints much more output (all your print's)
  • docker-compose run -entrypoint sh # starts a shell, and you can run docker/entrypoint manually
  • either as ./docker/entrypoint
  • or as ./manage.py runserver # but you need to start celery manually as well !

Those are progressively more bare-metal steps to debug.